NIOSH Information Circular - 9496

An introduction to UWB over coax technology for HD.

"This document
paper provides a brief description of UWB-over-Coax technology
(Ultra-wide-Band-over-Coax). It discusses the motivation for and
benefits of UWB-over-Coax, its application, and some initial
research findings in relation to high definition signals..."

I personally had the opportunity to do some hands on work with Freescale's, now defunct,
prototype UWB
modules, using the XS110 chipset. In our testing of the
modules we could not get a signal across a large open room. The
problem is that current state of the art in antenna design,
design the antennas to operate within a small resonant frequency
range, which is exactly what you do NOT want to have with UWB. It
is my personal view that others have run into the same issue and
hence are now talking about UWB over coax.

The Art and Science of Ultrawideband Antennas by Hans
Schantz; 2005 by Artch House Publishing may
be interest to you.

"I can't help but wonder whether the latest UWB noise is just a
last-ditch attempt to salvage a problematic technology."

"The issue is not whether UWB can cause interference; it is possible to
construct usage models that interfere with other systems. The debate
is over whether these usage models are relevant and whether the
interference is serious enough to warrant protection of the victim
service. By Jim Lansford, CTO, Alereon."